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Drivers who want to drive combination vehicles must pass the combination vehicles test. The South Dakota CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the South Dakota CDL Manual. Take this practice test now to prepare for the actual SD CDL combination test!
1. What is a pull up when referring to truck driving?
Using the speedometer to know when to shift up.
A specific maneuver used to decelerate smoothly in the exit lane.
When a driver stops and pulls forward to get a better position.
A driving maneuver used to pull your vehicle over to the side of the road and stop.
2. Most hydraulic brake failures occur for one of two reasons, one of which is:
loss of hydraulic pressure.
relying too much on the engine braking effect.
driving in cold weather.
excessive downshifting.
3. When inspecting the coupling, check that the safety latch is:
in the "lock" position.
in position over the locking lever.
pushing against the kingpin.
None of the above.
4. Off-tracking is:
when a vehicle makes a turn and the rear wheels of the trailer end up driving in a different path than the tractor and the front wheels of the trailer.
when the tires lose their contact with the road and have little or no traction.
when a vehicle towing a trailer skids, and the trailer pushes the towing vehicle from behind until it spins the vehicle around.
None of the above.
5. When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
secured with enough slack for turns.
secured with enough air leaks for turns.
properly greased.
None of the above.
6. How can you tell if a converter dollie has ABS?
There is a red lamp on the left side of the dolly.
There is an ABS plaque on the right side of the dolly.
There is a yellow lamp on the left side of the dolly.
There is an ABS system on the right side of the dolly.
7. A truck tractor with _________ requires the shortest stopping distance.
a lightly loaded trailer
a fully loaded trailer
an empty trailer
Weight has no impact on stopping distance.
8. When backing a tractor under a trailer:
the trailer will be lifted slightly when the tractor backs under it.
the end of the kingpin will be even with the top of the fifth wheel.
the fifth-wheel will come out from under the trailer.
you should lift the trailer off the fifth-wheel.
9. Most heavy trucks with manual transmissions require ____ to change gears.
single clutching
double clutching
triple clutching
None of the above.
10. If there is a cargo fire in a van or box trailer, you should:
keep the doors shut.
enlist the help of bystanders.
keep driving until you reach help.
open the doors, especially if your cargo contains hazardous materials.
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SD CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
Number of questions: 20
Correct answers to pass:16
Passing score:80%
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